Skip to content

A Study of Retatrutide (LY3437943) in Participants Who Have Obesity or Overweight

A Master Protocol to Investigate the Efficacy and Safety of LY3437943 Once Weekly in Participants Without Type 2 Diabetes Who Have Obesity or Overweight: A Randomized, Double-Blind, Placebo-Controlled Trial (TRIUMPH-1)

Status
Completed
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT05929066
Acronym
TRIUMPH-1
Enrollment
2335
Registered
2023-07-03
Start date
2023-07-10
Completion date
2026-04-30
Last updated
2026-08-21

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Obesity, Obstructive Sleep Apnea, Osteoarthritis, Knee, Overweight

Brief summary

The purpose of this study is to evaluate the efficacy and safety of retatrutide in participants who have obesity or overweight (J1I-MC-GZBJ master protocol) including subsets of participants who have knee osteoarthritis (OA) (J1I-MC-GOA1) or who have obstructive sleep apnea (OSA) (J1I-MC-GSA1). This study will last about 89 weeks and will include up to 24 visits. Addendum (2) is optional and available to approximately 500 participants to continue treatment with retatrutide for up to an additional 24 weeks.

Interventions

DRUGRetatrutide

Administered SC

DRUGPlacebo

Administered SC

Sponsors

Eli Lilly and Company
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Investigator)

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Have body mass index (BMI) ≥30.0 kilograms per square meter (kg/m²), or ≥27.0 kg/m² with at least one of the following: * hypertension * dyslipidemia * obstructive sleep apnea, or * cardiovascular disease * History of at least one unsuccessful dietary effort to reduce body weight GOA1 Inclusion Criteria: * Have index knee pain for \>12 weeks prior to screening, and presence of index knee pain for \>15 days over the previous month * Have knee X-ray with moderate radiographic changes (Kellgren-Lawrence Grade 2 or 3) per central reading at screening * Currently meets American College of Rheumatology (ACR) Criteria (clinical and radiological) for OA. GSA1 Inclusion Criteria: * Previously diagnosed with OSA * Have AHI ≥15 on polysomnography at screening (definition of moderate-to-severe OSA) * For participants not on positive airway pressure (PAP) therapy: unable or unwilling to use PAP therapy and have not used PAP for at least 4 weeks prior to screening. * If on PAP therapy, have been on PAP therapy for at least 3 consecutive months prior to screening, and willing to temporarily stop using PAP therapy for approximately 7 days prior to each of the sleep study (PSG) visits. GZBJ Addenda (2) inclusion criteria: * Have completed the final treatment visit of GZBJ Week 80.

Exclusion criteria

* Have a self-reported or documented change in body weight \>5 kg (11 pounds) within 90 days. * Have taken weight loss drugs, including over-the-counter medications, within 90 days prior to screening. * Have a prior or planned surgical treatment for obesity. * Have diabetes mellitus. * Have family or personal history of medullary thyroid carcinoma (MTC) or multiple endocrine neoplasia syndrome type 2 (MEN-2) * Have had pancreatitis. GOA1

Design outcomes

Primary

MeasureTime frame
Percent Change From Baseline in Body WeightBaseline, Week 80
Change from Baseline in Apnea-Hypopnea Index (AHI) Events Per Hour for GSA1 SubsetBaseline, Week 80
Change from Baseline in the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) Pain Subscale Score for GOA1 SubsetBaseline, Week 80
Percent Change from Baseline in Body Weight in Participants in Extension SubsetBaseline, Week 104

Secondary

MeasureTime frameDescription
Percent Change from Baseline in Body Weight in Participants with Baseline BMI ≥ 35 kg/m2Baseline, Week 80
Percentage of Participants who Achieve Body Weight Reduction of ≥ 5%Baseline through Week 80
Percentage of Participants who Achieve Body Weight Reduction of ≥ 10%Baseline through Week 80
Percentage of Participants who Achieve Body Weight Reduction of ≥ 15%Baseline through Week 80
Percentage of Participants who Achieve Body Weight Reduction of ≥ 20%Baseline through Week 80
Percentage of Participants who Achieve Body Weight Reduction of ≥ 25%Baseline through Week 80
Percentage of Participants who Achieve Body Weight Reduction of ≥ 30%Baseline through Week 80
Percentage of Participants who Achieve Body Weight Reduction of ≥ 35%Baseline through Week 80
Change from Baseline in Waist CircumferenceBaseline, Week 80
Change from Baseline in Systolic Blood Pressure (SBP)Baseline, Week 80
Percent Change from Baseline in TriglyceridesBaseline, Week 80
Percent Change from Baseline in Non-High-Density Lipoprotein (HDL)-CholesterolBaseline, Week 80
Percent Change form Baseline in Fasting InsulinBaseline, Week 80
Percent Change from Baseline in High-Sensitivity C-Reactive Protein (hsCRP)Baseline, Week 80
Change from Baseline in Short Form 36 Version 2 (SF-36v2) Acute Form Physical Functioning Domain ScoreBaseline, Week 80
Change from Baseline in Impact of Weight on Quality of Life-Lite Clinical Trial (IWQOL-Lite-CT) Physical Function Composite ScoreBaseline, Week 80
Change from Baseline in IWQOL-Lite-CT Psychosocial Composite ScoreBaseline, Week 80
Change from Baseline in Body Mass Index (BMI)Baseline, Week 80
Percentage of Participants who Achieve Waist-to-Height Ratio (WHtR) <0.5Baseline through Week 80
Change from Baseline in HbA1cBaseline, Week 80
Change from Baseline in Estimated Glomerular Filtration Rate (eGFR)Baseline, Week 80
Percentage of Participants with a Change in Medication UseBaseline through Week 80
Percentage of Participants who Develop Type 2 DiabetesBaseline through Week 80
Time to Onset of Type 2 DiabetesBaseline through Week 80
Percent Change from Baseline in AHI for GSA1 SubsetBaseline, Week 80
Percentage of Participants with ≥50% AHI Reduction from Baseline for GSA1 SubsetBaseline to Week 80
Percentage of Participants with AHI <5 or with AHI 5-14 with Epworth Sleepiness Scale (ESS) ≤10 for GSA1 SubsetWeek 80
Percent Change from Baseline in Sleep Apnea-Specific Hypoxic Burden for GSA1 SubsetBaseline, Week 80
Change from Baseline in Patient-Reported Outcomes Measurement Information System (PROMIS) Short Form Sleep-related Impairment 8a T-score for GSA1 SubsetBaseline, Week 80
Change from Baseline in AHI Events Per Hour for GSA1 Subset in Participants with Baseline Body Mass Index (BMI) ≥ 35 kg/m2Baseline, Week 80
Percentage of Participants who Achieve AHI < 5 for GSA1 SubsetBaseline, Week 80
Change from Baseline in ESS Score for GSA1 SubsetBaseline, Week 80
Change from Baseline in Functional Outcomes of Sleep Questionnaire (FOSQ) Total ScoreBaseline to Week 80
Change from Baseline in PROMIS Sleep Disturbance Short Form 8b T-Score for GSA1 SubsetBaseline, Week 80
Change from Baseline in Neck Circumference for GSA1 SubsetBaseline, Week 80
Change from Baseline in the WOMAC Physical Function Subscale Score for GOA1 SubsetBaseline, Week 80
Percentage of Participants who Achieve ≥ 50% Reduction in the WOMAC Pain Subscale for GOA1 SubsetBaseline through Week 80
Percentage of Participants who Achieve ≥ 50% Reduction in the WOMAC Physical Function Subscale for GOA1 SubsetBaseline through Week 80
Change from Baseline in the WOMAC Pain Subscale Score for GOA1 Subset with Baseline BMI ≥ 35 kg/m2Baseline, Week 80
Change from Baseline in the WOMAC Stiffness Subscale Score for GOA1 SubsetBaseline, Week 80
Change from Baseline in the WOMAC Total Score for GOA1 SubsetBaseline, Week 80
Change from Baseline in Average Pain Intensity Numeric Rating Scale (API-NRS) Score for GOA1 SubsetBaseline, Week 80
Change from Baseline in Worst Pain Intensity Numeric Rating Scale (WPI-NRS) Score for GOA1 SubsetBaseline, Week 80
Percentage of Participants with an Improved Categorical Shift in Patient Global Impression of Severity (PGIS) - Target Knee Function for GOA1 SubsetBaseline through Week 80
Percentage of Participants with an Improved Categorical Shift in PGIS - Target Knee Pain for GOA1 SubsetBaseline through Week 80
Change from Baseline in EQ-5D-5L for GOA1 SubsetBaseline, Week 80
Percentage of Participants with a Change in Use of Allowed Concomitant Pain Medication for GOA1 SubsetBaseline through Week 80
Change from Baseline in Joint Space Width for GOA1 SubsetBaseline, Week 80
Pharmacokinetics (PK): Steady State Area Under the Concentration Time Curve (AUC)Baseline through Week 80AUC is presented as a single average measure of AUC across the study duration.

Countries

Australia, Brazil, Canada, Hungary, India, Mexico, Poland, Puerto Rico, Romania, Spain, United Kingdom, United States

Contacts

STUDY_DIRECTORCall 1-877-CTLILLY (1-877-285-4559 or 1-317-615-4559 Mon - Fri 8 AM - 8 PM Eastern Time (UTC/GMT - 5 hours, EST)

Eli Lilly and Company

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Aug 22, 2026